Struct cap_std::fs::Dir

pub struct Dir { /* private fields */ }

A reference to an open directory on a filesystem.

This does not directly correspond to anything in std, however its methods correspond to the functions in std::fs and the constructor methods for std::fs::File.

Unlike std::fs, this API’s canonicalize returns a relative path since absolute paths don’t interoperate well with the capability model.

Implementations

impl Dir

pub fn from_std_file(std_file: File) -> Self

Constructs a new instance of Self from the given std::fs::File.

To prevent race conditions on Windows, the file must be opened without FILE_SHARE_DELETE.

This grants access the resources the std::fs::File instance already has access to.

pub fn into_std_file(self) -> File

Consumes self and returns a std::fs::File.

pub fn open<P: AsRef<Path>>(&self, path: P) -> Result<File>

Attempts to open a file in read-only mode.

This corresponds to std::fs::File::open, but only accesses paths relative to self.

pub fn open_with<P: AsRef<Path>>(
    &self,
    path: P,
    options: &OpenOptions
) -> Result<File>

Opens a file at path with the options specified by options.

This corresponds to std::fs::OpenOptions::open.

Instead of being a method on OpenOptions, this is a method on Dir, and it only accesses paths relative to self.

pub fn open_dir<P: AsRef<Path>>(&self, path: P) -> Result<Self>

Attempts to open a directory.

pub fn create_dir<P: AsRef<Path>>(&self, path: P) -> Result<()>

Creates a new, empty directory at the provided path.

This corresponds to std::fs::create_dir, but only accesses paths relative to self.

pub fn create_dir_all<P: AsRef<Path>>(&self, path: P) -> Result<()>

Recursively create a directory and all of its parent components if they are missing.

This corresponds to std::fs::create_dir_all, but only accesses paths relative to self.

pub fn create_dir_with<P: AsRef<Path>>(
    &self,
    path: P,
    dir_builder: &DirBuilder
) -> Result<()>

Available on non-WASI only.

Creates the specified directory with the options configured in this builder.

This corresponds to std::fs::DirBuilder::create.

pub fn create<P: AsRef<Path>>(&self, path: P) -> Result<File>

Opens a file in write-only mode.

This corresponds to std::fs::File::create, but only accesses paths relative to self.

pub fn canonicalize<P: AsRef<Path>>(&self, path: P) -> Result<PathBuf>

Returns the canonical form of a path with all intermediate components normalized and symbolic links resolved.

This corresponds to std::fs::canonicalize, but instead of returning an absolute path, returns a path relative to the directory represented by self.

pub fn copy<P: AsRef<Path>, Q: AsRef<Path>>(
    &self,
    from: P,
    to_dir: &Self,
    to: Q
) -> Result<u64>

Copies the contents of one file to another. This function will also copy the permission bits of the original file to the destination file.

This corresponds to std::fs::copy, but only accesses paths relative to self.

pub fn hard_link<P: AsRef<Path>, Q: AsRef<Path>>(
    &self,
    src: P,
    dst_dir: &Self,
    dst: Q
) -> Result<()>

Creates a new hard link on a filesystem.

This corresponds to std::fs::hard_link, but only accesses paths relative to self.

pub fn metadata<P: AsRef<Path>>(&self, path: P) -> Result<Metadata>

Given a path, query the file system to get information about a file, directory, etc.

This corresponds to std::fs::metadata, but only accesses paths relative to self.

pub fn dir_metadata(&self) -> Result<Metadata>

Queries metadata about the underlying directory.

This is similar to std::fs::File::metadata, but for Dir rather than for File.

pub fn entries(&self) -> Result<ReadDir>

Returns an iterator over the entries within self.

pub fn read_dir<P: AsRef<Path>>(&self, path: P) -> Result<ReadDir>

Returns an iterator over the entries within a directory.

This corresponds to std::fs::read_dir, but only accesses paths relative to self.

pub fn read<P: AsRef<Path>>(&self, path: P) -> Result<Vec<u8>>

Read the entire contents of a file into a bytes vector.

This corresponds to std::fs::read, but only accesses paths relative to self.

pub fn read_link<P: AsRef<Path>>(&self, path: P) -> Result<PathBuf>

Reads a symbolic link, returning the file that the link points to.

This corresponds to std::fs::read_link, but only accesses paths relative to self.

pub fn read_to_string<P: AsRef<Path>>(&self, path: P) -> Result<String>

Read the entire contents of a file into a string.

This corresponds to std::fs::read_to_string, but only accesses paths relative to self.

pub fn remove_dir<P: AsRef<Path>>(&self, path: P) -> Result<()>

Removes an empty directory.

This corresponds to std::fs::remove_dir, but only accesses paths relative to self.

pub fn remove_dir_all<P: AsRef<Path>>(&self, path: P) -> Result<()>

Removes a directory at this path, after removing all its contents. Use carefully!

This corresponds to std::fs::remove_dir_all, but only accesses paths relative to self.

pub fn remove_open_dir(self) -> Result<()>

Remove the directory referenced by self and consume self.

Even though this implementation works in terms of handles as much as possible, removal is not guaranteed to be atomic with respect to a concurrent rename of the directory.

pub fn remove_open_dir_all(self) -> Result<()>

Removes the directory referenced by self, after removing all its contents, and consume self. Use carefully!

Even though this implementation works in terms of handles as much as possible, removal is not guaranteed to be atomic with respect to a concurrent rename of the directory.

pub fn remove_file<P: AsRef<Path>>(&self, path: P) -> Result<()>

Removes a file from a filesystem.

This corresponds to std::fs::remove_file, but only accesses paths relative to self.

pub fn rename<P: AsRef<Path>, Q: AsRef<Path>>(
    &self,
    from: P,
    to_dir: &Self,
    to: Q
) -> Result<()>

Rename a file or directory to a new name, replacing the original file if to already exists.

This corresponds to std::fs::rename, but only accesses paths relative to self.

pub fn set_permissions<P: AsRef<Path>>(
    &self,
    path: P,
    perm: Permissions
) -> Result<()>

Available on non-WASI only.

Changes the permissions found on a file or a directory.

This corresponds to std::fs::set_permissions, but only accesses paths relative to self. Also, on some platforms, this function may fail if the file or directory cannot be opened for reading or writing first.

pub fn symlink_metadata<P: AsRef<Path>>(&self, path: P) -> Result<Metadata>

Query the metadata about a file without following symlinks.

This corresponds to std::fs::symlink_metadata, but only accesses paths relative to self.

pub fn write<P: AsRef<Path>, C: AsRef<[u8]>>(
    &self,
    path: P,
    contents: C
) -> Result<()>

Write a slice as the entire contents of a file.

This corresponds to std::fs::write, but only accesses paths relative to self.

pub fn symlink_file<P: AsRef<Path>, Q: AsRef<Path>>(
    &self,
    original: P,
    link: Q
) -> Result<()>

Available on Windows only.

Creates a new file symbolic link on a filesystem.

The original argument provides the target of the symlink. The link argument provides the name of the created symlink.

Despite the argument ordering, original is not resolved relative to self here. link is resolved relative to self, and original is not resolved within this function.

The link path is resolved when the symlink is dereferenced, relative to the directory that contains it.

This corresponds to std::os::windows::fs::symlink_file, but only accesses paths relative to self.

pub fn symlink_dir<P: AsRef<Path>, Q: AsRef<Path>>(
    &self,
    original: P,
    link: Q
) -> Result<()>

Available on Windows only.

Creates a new directory symlink on a filesystem.

The original argument provides the target of the symlink. The link argument provides the name of the created symlink.

Despite the argument ordering, original is not resolved relative to self here. link is resolved relative to self, and original is not resolved within this function.

The link path is resolved when the symlink is dereferenced, relative to the directory that contains it.

This corresponds to std::os::windows::fs::symlink_dir, but only accesses paths relative to self.

pub fn try_clone(&self) -> Result<Self>

Creates a new Dir instance that shares the same underlying file handle as the existing Dir instance.

pub fn exists<P: AsRef<Path>>(&self, path: P) -> bool

Returns true if the path points at an existing entity.

This corresponds to std::path::Path::exists, but only accesses paths relative to self.

pub fn try_exists<P: AsRef<Path>>(&self, path: P) -> Result<bool>

Returns true if the path points at an existing entity.

This corresponds to std::fs::try_exists, but only accesses paths relative to self.

API correspondence with std

This API is not yet stable in std, but is likely to be. For more information, see the tracker issue.

pub fn is_file<P: AsRef<Path>>(&self, path: P) -> bool

Returns true if the path exists on disk and is pointing at a regular file.

This corresponds to std::path::Path::is_file, but only accesses paths relative to self.

pub fn is_dir<P: AsRef<Path>>(&self, path: P) -> bool

Checks if path is a directory.

This is similar to std::path::Path::is_dir in that it checks if path relative to Dir is a directory. This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links, this will return false.

pub fn open_ambient_dir<P: AsRef<Path>>(
    path: P,
    ambient_authority: AmbientAuthority
) -> Result<Self>

Constructs a new instance of Self by opening the given path as a directory using the host process’ ambient authority.

Ambient Authority

This function is not sandboxed and may access any path that the host process has access to.

pub fn open_parent_dir(
    &self,
    ambient_authority: AmbientAuthority
) -> Result<Self>

Constructs a new instance of Self by opening the parent directory (aka “..”) of self, using the host process’ ambient authority.

Ambient Authority

This function accesses a directory outside of the self subtree.

pub fn create_ambient_dir_all<P: AsRef<Path>>(
    path: P,
    ambient_authority: AmbientAuthority
) -> Result<()>

Recursively create a directory and all of its parent components if they are missing, using the host process’ ambient authority.

Ambient Authority

This function is not sandboxed and may access any path that the host process has access to.

pub fn reopen_dir<Filelike: AsFilelike>(dir: &Filelike) -> Result<Self>

Construct a new instance of Self from existing directory file descriptor.

This can be useful when interacting with other libraries and or C/C++ code which has invoked openat(..., O_DIRECTORY) external to this crate.

Trait Implementations

impl AsHandle for Dir

Available on Windows only.

fn as_handle(&self) -> BorrowedHandle<'_>

Borrows the handle.

impl AsRawHandle for Dir

Available on Windows only.

fn as_raw_handle(&self) -> RawHandle

Extracts the raw handle.

impl AsRawHandleOrSocket for Dir

Available on Windows only.

fn as_raw_handle_or_socket(&self) -> RawHandleOrSocket

Like AsRawHandle::as_raw_handle and AsRawSocket::as_raw_socket but can return either type.

impl Debug for Dir

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<Dir> for OwnedHandle

Available on Windows only.

fn from(dir: Dir) -> OwnedHandle

Converts to this type from the input type.

impl From<OwnedHandle> for Dir

Available on Windows only.

fn from(handle: OwnedHandle) -> Self

Converts to this type from the input type.

impl FromRawHandle for Dir

Available on Windows only.

unsafe fn from_raw_handle(handle: RawHandle) -> Self

To prevent race conditions on Windows, the handle must be opened without FILE_SHARE_DELETE.

impl IntoRawHandle for Dir

Available on Windows only.

fn into_raw_handle(self) -> RawHandle

Consumes this object, returning the raw underlying handle.

impl IntoRawHandleOrSocket for Dir

Available on Windows only.

fn into_raw_handle_or_socket(self) -> RawHandleOrSocket

Like IntoRawHandle::into_raw_handle and IntoRawSocket::into_raw_socket but can return either type.